Earlier quoted context omitted.
Side note, but what's with the trend of people saying/spelling "biased" as "bias"? Is it just because the "-sed" in "biased" kind of blends together when pronounced / is awkward to clearly separate, so eventually some people just think that's what the word is? (I know a lot of words across many/all languages develop that way, so not really complaining, but when you're in the midst of it it feels a bit weird.)
The use of the word "bias" as an adjective there is technically incorrect. I've only seen it just now in the phrase "non-bias social network" - but I hope it does not catch on. > Bias vs. Biased > In recent years, we have seen more evidence of the adjectival bias in constructions like “a bias news program” instead of the more usual “a biased news program.” > The reason is likely because of aural confusion: the -ed of…
From this literal sense of "slant," you get the figurative sense of "inclination" or "preferential treatment." This meaning appears in quotations hundreds of years old.
Finally, as "biased" stops being a fancy newspaper word and enters the popular lexicon, it gets subjected to regular pronunciation tendencies. And one of those tendencies is the simplification and elimination of -d at the ends of words. A lot of people in the US pronounce "hand me that" as "hammy that," "send me an email" as "simmy an email," and so on.
So it's not surprising that saying and writing "bias" instead of "biased" is popular.